On Sat, 18 Mar 2006 20:45:38 +0000 (UTC), "Reg Edwards"
wrote:

Owen, you know as well as I do his SWR meter does not indicate SWR on
the feedline where it might matter. So some of your comments don't
make much sense.

Reg,

If Basil measured the SWR at the ATU end of the RG8/X (either directly
or effectively with the ATU in bypass configuration if that is
possible), that would provide information that could be used to
estimate whether losses in the RG8/X were reasonable, and if
reasonable, how reasonable.

The RG8/X is probably the highest risk of serious loss in the antenna
system.

For clarity, I am not at all interested in the VSWR indicated looking
into the ATU unless the ATU is in the bypass configuration, in which
case the measurement is a valid indicator of the VSWR on the RG8/X.

The line loss of 50' of RG8/X at 3.6MHz with a source end VSWR of 8:1
is around 1dB, and probably quite acceptable. Beyond a source end VSWR
of 20:1, losses increase quickly to infinite loss at source end VSWR
around 28:1. If the indicated reflected *power* at the ATU end of the
coax is less than about 80%, or VSWR less than about 20, coax loss is
probably manageable.

Owen
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